Description

The strfind() function returns the offset of the first occurrence of the
second string, as2, if it is a substring of string as1.
If the second string is not a substring of the first string
strfind() returns -1.

The strrspn() function trims chartacters from a string. It searches from the
end of string for the first character that is not contained in
tc. If such a character is found, strrspn() returns a pointer to the
next character; otherwise, it returns a pointer to string.

The strtrns() function transforms string and copies it into
result. Any character that appears in old is replaced with
the character in the same position in new. The new
result is returned.

Usage

When compiling multithreaded applications, the _REENTRANT flag must be defined on the
compile line. This flag should only be used in multithreaded applications.